<h3>描述</h3>
<p>自定义样式：</p>
<h3>示例</h3>
<ti-upload [url]="url" type="drag" uploadBtnWidth="456px" uploadBtnHeight="116px">
  <ng-template #uploadContainer>
    <p>添加文件</p>
  </ng-template>
</ti-upload>
